core/homeassistant/components/voip/config_flow.py

"""Config flow for VoIP integration."""
from __future__ import annotations

from typing import Any

from homeassistant import config_entries
from homeassistant.data_entry_flow import FlowResult

from .const import DOMAIN


class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
    """Handle a config flow for VoIP integration."""

    VERSION = 1

    async def async_step_user(
        self, user_input: dict[str, Any] | None = None
    ) -> FlowResult:
        """Handle the initial step."""
        if self._async_current_entries():
            return self.async_abort(reason="single_instance_allowed")

        if user_input is None:
            return self.async_show_form(step_id="user")

        return self.async_create_entry(
            title="Voice over IP",
            data=user_input,
        )